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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff40b0fdb2c5c8b8fd7a93795bcece37d958b99b23100ee7c924d86187b965ed' 
  AND token = 'BGILMV34FVNdiGwKVz7u3vrndon8uGbur+wYMHc7LjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}